Counting & Writing Numbers to 120 — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. What number is 1 more than 89? 90
Adding 1 to 89 gives you 90 because 89 + 1 = 90.
2. What number is 1 less than 111? 110
One less than 111 is 110 because 111 - 1 = 110.
3. Fill in: 56, 57, 58, 59
The missing number is 58 because when counting by ones, the numbers go 56, 57, 58, 59 in order.
4. Fill in: 98, 99, 100, 101
The missing number is 100 because 99 + 1 = 100, and then 100 + 1 = 101.
5. Count by tens: 10, 20, 30, 40
When counting by tens, you add 10 each time, so 30 + 10 = 40.
6. What is 10 more than 105? 115
Adding 10 to 105 gives you 115 because 105 + 10 = 115.
7. Fill in: 114, 115, 116, 117
The missing number is 115 because the numbers count by ones: 114, 115, 116, 117.
8. What is 1 more than 99? 100
One more than 99 is 100 because 99 + 1 = 100, moving from a two-digit number to a three-digit number.
9. Count by tens: 70, 80, 90, 100
When counting by tens, you add 10 each time, so 90 + 10 = 100.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
The number after 99
→ 100
120
Ten more than 50
→ 60
60
One less than 80
→ 79
79
The number after 119
→ 120
100
99 + 1 = 100; 50 + 10 = 60; 80 - 1 = 79; and 119 + 1 = 120.